Packing.



G. NICCADDEN.

PACKING.

APPucATloN FILED 158.16, 1914.

'Patented May11,1915.

WITNESSES I GEORGE MCQADDEN, OF ST. CLOUD, MINNESOTA.- i

IPCKING'.

Lisanne.

Specification of Letters Patent.

atentedltay 11, i915.

Application led February 16, 191s. Serial No. 823,915.

packing from one end of the cylinder to thel other end thereof.

In order to accomplish the desired result, usc is made of a split inner or expanding ring and an expanding split outer olf` bearing ring, the oute and inner peripheries of the said rings being concentric and thejoint between the rings being eccentric, each ring having at its thinnest portion a lap joint, the

.lap joints of the. two rings being approximately diainetrically opposite to each other. Use is also made of one or more retaining pins held in one of the rings and loosely engaging the other ring.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this spccilication, in which similar characters of reference indicate corresj'ionding parts in looth views.

Figure l is a plan view of the packing with parts shown in section; and Fig. 2 is a side elevation of a piston provided with my improved packings, one of the paekings being shown in section.

The packing consists essentially of an inner or expanding ring A and an expanding outer or bearing ring B, one overlying the other, and the outer and inner peripheries of the rings A and ll being concentric while the joint C between the rings A and B is eccentric, as plainlyl shown in Fig. l. The eri-y panding ring A is provided at its thinnest portion with a lap or rabbet joint or initer or plain joint il', and. a similar lap or rabbct joint B (but not ay miter or plain joint) is arranged at the thinnest portion of theouter or bear-ino rin(r l. -the 'oints A and B" bel: D i

ing preferably arranged diainetrically opposite cach other, as shown in `Fig. 1. Each of the joints Af, B, is .formed by providing the endsv of cach rinfr A or Bat opposite sides with rabhets, caen having a depth corresponding to one-halt' the width lof the ring, and of a. length preferablylv the same as or somewhat in excess of the width of the ring, as will be readily understood by reference to Fig. 2. B y constructing the. joint of each ring in the manner described gas is prevented Vfrom leaking across the joint and any gas that passes down the joint B encounters the unbroken surface of the thick portion of the inner ring A and is thus checked or retarded and is hencel not liable to leak past the packing. It will also be noticed that hy arranging the joints A and B, as shown and described, the eliciency of the joints is not affected by wear of the rings.

In order to hold the rings A and B against creeping or .lateral movement one relatively to the other, use is made of one or a series of retaining pins D, each preferably attached to the expanding ring A and extending radially therefrom and loosely engaging a recess formed in the inner face of the outery or bearing ring B. lt will be noticed that by this arrangement the retaining pinD does not project to the outer peripheral face of the outer or bearing ring B or the inner face of the inner ring A, and hence the pin is not liable to work out orI come in Contact with the inner surfaces of the cylinder in which reciprocatcs the piston E provided with the packing, as shown inFig. 2. ln case aQpinfbccornes loose it is not liable to fall out and drop into the ring groove. lVhen using a series of retaining pins D, as shown in Fig. l, such pins are located in less than one-half portion of cach ring, so that the other half portion is free to expand and contract as the case may be.

By providing the lap or rabbet joints A and B onboth rings A and B and locating the same diametrically opposite each other, it is evident that the motive 'agent under pressure is not liahle to leak past the packing..

-As shown in. section in Fig. 2- both rings A and B are the same thickness at thelr 11p-'l per and lower edges: that is, the upper and lower edges are at right angles to the inner and outer faces.

Having thas described my invention, claim as new and desire to secure by Letters Patent:

l. A piston packing comprising an inner expanding ring and an outer expanding bearing ring, the inner and outer peripheries of the rings being concentric and the joint between the rings being eccentric, each ring having at its thinnest portion a. lap joint,

seid lap joints being located diemetree'lly opposite each other', a retaining p n rigidly secured to the inner ring and pro]ecting re.

dially from the outer face thereof, the outer ring having a radial socket extending outwardly and partly through said ring Where by the radial pin may loosely engage the socket to prevent circumferential movement of the rings and provide a smooth outer sur face for the outer ring over said socket.

2. piston packing vcomprising an inner expanding and an outer expanding bearing ring, the inner and outer peripheries of the rings being concentric and the joint between the rings being eccentric, each ring having at its thinnest portion a lap joint, the said joints being wholly unobstructed and approximately diametrically opposite euch other, a series of spaced'retaining pins promesses, y

jeeting radially from the outer face of the inner ring and rigidly secured to said ring, and radial recesses in the inner face of the outer ring et n suitable distance from its lapped ends., the said retaining pins being located in less than one half portion of its ring and of less length than the combined thickness of the inner and outer rings Whereby said pins loosely engage said radial reeesses and e smooth outer face on the outer rin over said pins is provided.

i testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Geenen MGCADDEN.

lVitnesses:

'HENRY H. SULLIVAN,

M. A. DonnNEn. 

